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Due to its special partitioned stator structure and multi-excitation with two different types of permanent magnet, a new double-stator multi-excitation flux-switching machine (DSME-FSM) has advantages of high torque density, wide speed range, and low cost. For this kind of machine with complex structure, in order to realize the optimization accurately and efficiently, a multi-objective comprehensive optimal design method considering the different weights of the design objectives is presented based on parameters sensitivity analysis and genetic algorithm optimization in this paper. The parametric model of the machine is built up, and a trade-off objective function considering the different weights of the design objectives is defined. The key size parameters with strong sensitive are selected through parameters sensitivity analysis and then optimized by using the genetic algorithm method. The performance comparison between the initial and the optimized machines verifies the proposed optimization method. The anti-demagnetization property and the flux-weakening capability for a wide-speed range operation are also analyzed, which further confirms the DSME-FSM an interesting candidate for EV propulsion.

In this paper, a new less-rare-earth double-stator modulated machine is proposed, where two types of permanent magnets (PM) of rare-earth NdFeB-PM and nonrare-earth ferrite-PM are skillfully integrated into a stator-partitioned modulated machine. The operating principle of the proposed machine is introduced. Considering the multioperation conditions of traction motor for electric vehicle (EV), the new machine design dimension formulas are deduced. Then, the corresponding electromagnetic performances under different driving modes are also analyzed and simulated in details. Both theoretical analysis and the FEM results show that the proposed machine has advantages in multidriving modes, which may be an interesting candidate for EV driving application.